1988869 has 8 divisors (see below), whose sum is σ = 2056320. Its totient is φ = 1922400.

The previous prime is 1988851. The next prime is 1988887. The reversal of 1988869 is 9688891.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1988851) and next prime (1988887).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1988869 - 2⁵ = 1988837 is a prime.

It is a super-3 number, since 3×1988869³ = 23601510047533316727, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7204 + ... + 7474.

It is an arithmetic number, because the mean of its divisors is an integer number (257040).

2^1988869 is an apocalyptic number.

It is an amenable number.

1988869 is a deficient number, since it is larger than the sum of its proper divisors (67451).

1988869 is a wasteful number, since it uses less digits than its factorization.

1988869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491.

The product of its digits is 248832, while the sum is 49.

The square root of 1988869 is about 1410.2726686708. The cubic root of 1988869 is about 125.7579336704.

It can be divided in two parts, 19 and 88869, that added together give a palindrome (88888).

The spelling of 1988869 in words is "one million, nine hundred eighty-eight thousand, eight hundred sixty-nine".